Liquid ejecting head and liquid ejecting apparatus

Abstract

A liquid ejecting head includes a pressure generation chamber to which ink containing a flat plate-like particle is filled, a piezoelectric element generating pressure change on the ink in the pressure generation chamber, and a nozzle plate having a nozzle for discharging the ink from the pressure generation chamber due to the pressure change. The nozzle includes a first nozzle portion at an ink discharge surface side, and a second nozzle portion communicating with the first nozzle portion and formed at the pressure generation chamber side. When an opening diameter of the first nozzle portion at the discharge surface side is φ1 and an opening diameter of the second nozzle portion at the pressure generation chamber side is φ2, the nozzle satisfies φ2/φ1≧1.4.

What is claimed is: 
     
         1 . A liquid ejecting head comprising:
 a pressure generation chamber to which liquid containing a flat plate-like particle is filled;   a pressure generation unit that generates pressure change on the liquid in the pressure generation chamber with supply of a driving signal, and   a nozzle plate on which a nozzle for discharging the liquid in the pressure generation chamber with the pressure change is formed,   wherein the nozzle includes at least a first nozzle portion that is formed at a side of a discharge surface of the liquid and a second nozzle portion that communicates with the first nozzle portion and is formed at a side of the pressure generation chamber, and   the nozzle satisfies an expression of φ2/φ1≧1.4 when an opening diameter of the first nozzle portion at the side of the discharge surface is assumed to be φ1 and an opening diameter of the second nozzle portion at the side of the pressure generation chamber is assumed to be φ2.   
     
     
         2 . The liquid ejecting head according to  claim 1 ,
 wherein a relation between the opening diameters φ1 and φ2 satisfies an expression of φ2/φ1≧1.6   
     
     
         3 . The liquid ejecting head according to  claim 1 ,
 wherein the flat plate-like particle satisfies an expression of b/a≧0.03 when a dimension of a diagonal line on the surface of the flat plate-like particle is assumed to be a and the thickness of the flat plate-like particle is assumed to be b.   
     
     
         4 . A liquid ejecting apparatus comprising the liquid ejecting head according to  claim 1 . 
     
     
         5 . A liquid ejecting apparatus comprising the liquid ejecting head according to  claim 2 . 
     
     
         6 . A liquid ejecting apparatus comprising the liquid ejecting head according to  claim 3 .